Sharp MZ-5500 - Page 81

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DUA QJT --+-+---i
;c.--+--N
_.g
In'(
DUA QJT ----~-----I
Fig.13-1 RP5COI access timing
Tab]e 13-2 RP5C01 pin names and functions
Pin
name Pin No. Function
CS,
CS
1 ,2 For interfacing with the external device which becomes
valid when CS=H, CS=L. CS
is
connected
with
the power
down detect
circuit of
the device power supply and
CS
is connected with
the microcomputer.
ADJ 3 lt has
the
function to
adjust
the
seconds without
intervention of the CPU.
With ADJ=H
the seconds
are
reset to
zero when
it
is within 0
to
29
seconds.
lf
it is within 30
to 59
seconds,
the seconds are then
incremented.
AO
- A3
4,5,6,7 Address pin
to be
connected
with
the address bus of
the CPU.
1m 8
1/0
control
input. Low for input from the RP5C01 to
the CPU.
GND
9
OV
WR 10 1/0
control
input.
Low for
input from the CPU
to
the
RP5COl.
DO
- D3
11,12,
13, 14
Bidirectional data
bus.
Connected
with the CPU data
bus.
ALARM
15
Alarm, 16HzCK, 1HzCK pulse output. Open drain
output.
OSCIN,
OSCOUT
16,~7
32.768KHz
crystal oscillator
connection pins.
VCC 18 +5V supply